NDLI: Effect of MgTiO 3 Doping on Dielectric and Elasticity Properties of CaCu 3 Ti 4 O 12 ( CCTO ) Ceramics

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Effect of MgTiO 3 Doping on Dielectric and Elasticity Properties of CaCu 3 Ti 4 O 12 ( CCTO ) Ceramics

Content Provider	Semantic Scholar
Author	Rajmi, R. Yahya, A. K. Yusof, M. I. M.
Copyright Year	2011
Abstract	Effects of MgTiO3 addition on dielectric properties of CCTO ceramics were investigated. Dielectric measurements were performed for (1-x) CaCu3Ti4O12 – xMgTiO3 (x = 0-0.3) in the temperature and frequency range of 300-413K and 10 – 10 Hz, respectively. Pure CCTO (x=0) showed decrease in dielectric constant from 25,382 (at 10 Hz) to 14,924 (at 10 Hz) with increasing frequency. The dielectric loss of the sample decreased from 0.201 (at 10 Hz) to 0.140 (at 10 Hz). Addition of MgTiO3 caused reduction of dielectric constant with increasing x but significantly improved stability with frequency compared to the undoped x=0 sample. At x=0.1, reasonable values of the dielectric constant of 17,015 (at 10 Hz) and around 1.5-1.1 x10 (at 10 to 10 Hz) was obtained. In addition, MgTiO3 doping reduced the dielectric loss of the sample to around 0.15-0.10 in the range of 10-10 Hz. Further increase of MgTiO3 at x=0.3 the dielectric loss was reduced to below 0.05 (at 10 Hz). The reduction in dielectric loss could be attributed to the increase of grain boundary resistivity as the MgTiO3 content increased and to the increase in grains boundary density as a result of smaller grains size. Dielectric constant versus temperature measurements showed increase in dielectric constant with increasing temperature for all samples. Activation energy obtained from Arrhenius plots of log of conductivity, s versus 1000/T showed considerable increase in grainboundary activation energy, Egb with increasing MgTiO3 content indicating possible increase in potential barrier as a result of the doping. On the other hand, addition of MgTiO3 caused increase in shear and longitudinal velocity and related elastic moduli indicating improvement in elastic properties of CCTO with MgTiO3 addition.
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://ajbasweb.com/old/ajbas/2011/August-2011/405-416.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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